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Replacing bottom bracket? Possible gains/consequences

forestnot1forestnot1 Posts: 244
edited February 2015 in Workshop
Having taking off my crankset to change chainrings, running my finger around the bb bearings feels grainy.

Does this suggest that I should be replacing them? And If so, what would the benefits of doing so be, and consequences of not?

Posts

  • keezxkeezx Posts: 1,316
    What kind of BB ist it?
  • napoleondnapoleond Posts: 5,983
    Just take the seal off, clean out and regrease. If that doesn't work then the bearings are gone and time for a new bb.
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  • forestnot1forestnot1 Posts: 244
    It's a press fit bb30
  • trailflowtrailflow Posts: 1,311
    Replace them when they start to click.
  • jgsijgsi Posts: 5,029
    If you wait until click, then the bearings will have failed.
    If they are feeling notchy already, then replace.
    As a matter of interest, how clean/dry was that BB area? A great deal of problems users have with BB30 is allowing water to get into the bb area somehow and then forgetting to do anything about it but not forgetting to log onto forums and whinge about it.... OP note I not refer to you :wink:
  • trailflowtrailflow Posts: 1,311
    If you wait until click, then the bearings will have failed.

    Exactly. Why not get the most amount of use out of them ? I've had bearings last months longer after feeling rough/notchy.

    Relube them and see what happens.
  • agent nomadagent nomad Posts: 93
    Just changed a BB30 for a mate and the bearings where £8 each
  • trailflowtrailflow Posts: 1,311
    They can be bought cheaper. Search '6806 42x30x7mm' on ebay.
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